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"I stand with all these workers, all these mums and dads, all these young people, every day of the week," he wrote.

"The Liberals will try and wash their hands of this decision. Don't let them. They've laid the groundwork for years."

The cuts will cost some workers up to $6000 a year, the Victorian Trades Hall Council says, calling for Prime Minister Malcolm Turnbull to reverse the decision.

Opposition leader Matthew Guy says he was surprised by the cuts, but "it's a matter for Fair Work and that's a construct of the Gillard Labor government."

However, the Victorian Chamber of Commerce and Industry believes the decision will be better for business and workers.

"When businesses have decided to close on Sundays because they couldn't afford the penalty rates, casual workers didn't just miss out on a penalty loading but an entire wage for that day," executive director of policy and advocacy Bryce Prosser said.